基于WebGis的系統，都有大量的地圖數據需要處理，這些地圖數據和處理的結果要在服務器端和客戶端交流傳遞，需要大量的網絡數據傳送，容易造成用戶網頁瀏覽延遲。把大幅的地圖經過切片處理，分切成多幅小的切片，引入Ajax技術，設計高效的地圖局部顯示算法，使客戶端和服務器只交換需要更新的切片，不再重新加載不必要的數據，就可以在地圖顯示和處理的過程中有效的減少網絡數據傳送。
關鍵詞：WebGis； Ajax； 切片； 局部顯示
Abstract: There is a lot of map data needed to be addressed in the system which is based on
WebGis. Furthermore the map data and the results need to be communicated between the server and client , so it requires a large amount of data transmission which can causing the user web browser delayed. Introcducing Ajax technology , separating a big map into a number of small sub-section, designing local map shows algorithm efficiently, the client and server exchange only need to update the slice, no longer to reload the unnecessary data , On the map display and can handle the process of reducing the effective data transmission network
Key Words: WebGIS; Ajax; Tiles; Local Show